The early Jeepsters performance is leisurely at best. The L134 just isn't enough power. The F-head from 1950 was much improved.
I had opportunity to buy a friends's 1950 Jeepster with a 161 F head just last year, running and driving. He offered it to me for $2500, but I've got too many projects. In hindsight, I should have driven it home, but my girlfriend would have given me too much grief.
-Donny